diff --git a/display/config/1.2/IDisplayConfig.hal b/display/config/1.2/IDisplayConfig.hal
new file mode 100644
index 0000000..af8f154
--- /dev/null
+++ b/display/config/1.2/IDisplayConfig.hal
@@ -0,0 +1,55 @@
+/*
+* Copyright (c) 2018 The Linux Foundation. All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are
+* met:
+*    * Redistributions of source code must retain the above copyright
+*      notice, this list of conditions and the following disclaimer.
+*    * Redistributions in binary form must reproduce the above
+*      copyright notice, this list of conditions and the following
+*      disclaimer in the documentation and/or other materials provided
+*      with the distribution.
+*    * Neither the name of The Linux Foundation. nor the names of its
+*      contributors may be used to endorse or promote products derived
+*      from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+* ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package vendor.display.config@1.2;
+
+import @1.1::IDisplayConfig;
+
+interface IDisplayConfig extends @1.1::IDisplayConfig {
+   enum DisplayTypeExt : int32_t {
+        // primary display is just one, can be either builtin or pluggable.
+        DISPLAY_PRIMARY = 0,
+        DISPLAY_BUILTIN = 1,
+        DISPLAY_PLUGGABLE = 2,
+        DISPLAY_VIRTUAL = 3,
+    };
+
+    /*
+    * Sets display index range that caller defined for a given display type.
+    *
+    * @param disp_type display type.
+    * @param base start value in the range.
+    * @param count maximum number of supported display of this type.
+    *
+    * @return one of the hwc2 errors
+    */
+    @callflow(next="*")
+    setDisplayIndex(DisplayTypeExt disp_type, uint32_t base, uint32_t count)
+          generates  (int32_t error);
+};
diff --git a/display/current.txt b/display/current.txt
index ea6e2f8..570f10b 100644
--- a/display/current.txt
+++ b/display/current.txt
@@ -36,3 +36,4 @@ fcc31b8e0d422752cf4f4c69618488ea9cd5a4e0f21404adca087dc4ef23d6df vendor.display.
 f5c217947f9e7ddc9b20d339928adfb4c84fb91969119b2479e9993ca3e4db08 vendor.qti.hardware.display.composer@1.0::IQtiComposer
 6a1ce8d44bf75d2102ae54bddce02f2bc7bd064444c30402b6dea741114703de vendor.qti.hardware.display.composer@1.0::IQtiComposerClient
 db19f93c419a59c901c1530a9241480b047a0f026b2eef7fe0c55cf3874c56c0 vendor.qti.hardware.display.mapper@1.0::IQtiMapper
+503415d1b4d8aefe231fd751cc36e374e91d561f3d3dd3459f31f3a67aa6dfe5 vendor.display.config@1.2::IDisplayConfig